Coaster-brake.



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G. ZINTBR.

GOASTER BRAKE. APPLICATION FILED JUNE 19. 190s.

illllllllllllll UNITED sTATEs GUSTAV ZINTR, OF BUFFALO, NEW YORK.

ooAsTER-BRAK.

Application filed June 19,

Specification of Letters Patent.

Patented June 25, 1907. 1906. Serial No. 322,429.

To a/ZZ whom, it nea/y concern:

Be it known that I, GUsTAv ZINTER, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Coaster-Brakes, of which the following is a specification.

This invention relates to wheel-hubs for bicycles and more particularly to hubs provided With coasting and brake-devices. As is common in devices of this kind, a forward rotation of the sprocket-wheel causes a similar rotation of the hub-barrel, while upon holding the sprocket-wheel at rest, the hubbarrel is permitted to revolve freely, and upon rotating the sprocketheel slightly in a reverse direction the brake is applied to prevent rotation of the hub-barrel.

The objects of my invention are the production of a Wheel-hub for bicycles and the like, which is simple in construction, durable and reliable, effective and quickly responsive in action, and which is composed of very few parts; to provide a powerful brake-lever requiring an eXceedin ly short movement to effectively cause braing of the wheel; and to otherwise improve on back pedaling coaster-brake hubs now in use.

To these ends the invention consists in the construction, arrangement and combination of parts to be hereinafter described and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a longitudinal section through a coaster-brake hub embodying my invention. Fig; 2 is a transverse section taken on line 2 2, Fig. 1, lookin to the left. Fig. 3 is a transverse section ta en on line 3-3, Fig. 1, looking to the left. Fig. 4 is a transverse section taken on line 1*4, Fig. 1, also looking to the left. Fig. 5

is a longitudinal section taken on line 5 5,

Fig. 1. Fig. 6 is an elevation of the internal actuating parts removed from the hub-barrel. Fig. 7 is a detached perspective view of the wedge-segment retainer. Fig. 8 is a transverse section taken on line 8-8, Fig. l. Fig. 9 is a detached perspective view of one of the wedge-se ments.

Referring to t e drawings in detail, similar letters of reference refer to similar parts in the several figures.

The reference letter A indicates the lower or rear ends of the rear forks or frame members of a bicycle, in which the axle or spindle B of the driving-wheel is rigidly secured in the usual manner C designates the hub having the usual hubbarrel or sleeve D to which the spokes of the -wheel are secured. At one end of said sleeve a cup-cone or ball race- E is fitted so 'as to revolve with said sleeve, and secured to the spindle B is a cone F having an inwardly eX- tending portion f which is provided with a longitudinal external groove f1. Between said cup-cone and cone F, anti-friction-balls f2 are interposed. Ailixed to cone F, is an arm f i which is a'lilxed to a bracket f4 applied to one of -the frame-members A. Threaded cone G comprising an internally shouldered sleeve g and a fiat ring g1 held against the shoulder of said sleeve.

Mounted loosely on spindle B is a drivingsleeve H having an enlarged outer end providing an external half racewayh and an internal half raceway h1. Interposed between cup-cone G and the external half raceway t, is a series of anti-friction balls h2. Threaded onto spindle B is a cone I between which and the internal half raceway h1 of the drivingsleeve, a series of anti-friction balls 'i are interposed.

Threaded onto the outer end of drivingsleeve H is the sprocket-wheel J over which the usual driving-chain (not shown) passes a nut j being applied to said driving-sleeve to prevent unscrewing of said sprocket-wheel.

By reason of the hub-sleeve receiving support on the two series of anti-friction balls f 2 and h2, it may revolve independent of an other part of the hub, and when the drivingsleeve H is held against rotation, such action takes place. In order, however, to cause forward rotation of the hub-barrel when rotating the driving-sleeve in a forward direction or to cause braking of the hub-barrel, suitable devices for co-action between the two must be provided. This I accomplish by providing the driving-sleeve with opposite or eccentric cam-surfaces K and L, as clearly illustrated in Figs. 2 and 3, against which are held, respectively, propelling wedge-segments 7c and brake wedge segments Z, having correspondingly shaped eccentric inner bearing-surfaces k1 and Z1, respectiveyl, and concentric outer impinging-surfaccs k2 and Z2, respectively.

The wedge-segments are arranged in pairs and are retained in proper position by a retainer-ring M, having opposite lateral eXtensions, m at diametrically opposite points s :.5 @la enter notches m1 in the outerimpingingto the other end of the hub-barrel C is a cup-- IOO IIO

surfaces of said segments. Said notches are of sufficient depth to permit the necessary outward and inward movement of the wedgesegments with respect to the axis of the hub, so that they may iinpinge against surrounding parts. Said retainer-ring is split, as at N, one end thereof having a substantially circular opening n into which fits a correspondingly shaped extension nl formed at the other end of said ring This permitsl of easily applying the ring and retaining the wedge-segments in proper relation to each other and to the cam-surfaces of the drivingsleeve.

As shown in Figs. 1 and 5, sleeve g of the cup-cone G, is extended in rear of the ring g1 andv provides an internal impinging-surface for segments k to act against; but if desired, said extension may be omitted and the segments caused to impinge directly against the hub-barrel.

Arranged loosely within the hub-barrel and bearing against the inner end of cupcone G is a brake-actuating sleeve P which surrounds the brake-segment wedges Z and is closed at its inner end. Said sleeve is reduced in diameter at its inner end to provide a shoulder p. An expansible brake-sleeve R is arranged within the hub-barrel and is fitted onto the reduced end of the brake-actuating sleeve. Said brake-sleeve is provided with a longitudinal opening Rl extending from end to end thereof, in which is located a spreading or brake-lever S having a curved portion s between its ends which fits into a correspondingly formed notch r in one of the longitudinal edges of the brake-sleeve to rovide a suitable fulcrum for the lever. Said lever has one end thereof arranged to enter an aperture T in the brake-actuating sleeve and its other end curved at the edge, as at s1, at a point diagonally opposite the curved portion s; said curved portion s1 fitting a correspondingly shaped notch r1 in the other longitudinal edge of the brake-sleeve. The longitudinal edges of the said sleeve diverge at the end thereof adjacent the brake-actuating sleeve to allow the lever the necessary space for movement. Brake-sleeve Ris held against rotation b means of an ear r2 which enter the longitucinal groove f1 in cone F. The spindle B is securely aflixed to the frame by nuts U, as is common in bicycles.

The operation of the device is as follows: Driving of the wheel is effected by rotating the sprocket-wheelJ in a forward direction, (noted by the arrow in Fig. 2) which by reason of its being aflixed to the driving-sleeve H, causes the latter to rotate therewith and force the propelling Wedge-segments k outward to impinge against the surrounding shell. The eccentric surfaces c on the-driving-sleeve, in addition to forcing the segments lc outward, retain the same in their impinging position until forward rotation of the sprocket-wheel ceases, during which time the hub is compelled to rotate with thc driving sleeve and sprocket wheel. W'hen the sprocket-wheel is held at rest, the hub may rotate independent of other parts; the rotation of the hub causing propelling wedgesegments to recede or ride down the eccentric or cam-surfaces of the driving-sleeve; thereby permitting the hub to run entirely free on the roller-bearings. In order to apply the brake, the sprocketwheel is rotated rearward, (as noted bythe arrow in Fig. 3,)wl1ich causes the driving-sleeve H to rotate therewith. By reason of the cam or eccentric surfaces L on said sleeve and the co-acting brake wedge-segments being arranged reversely to surfacesl K and wedge-segments k, the wedgesegments l are forced against the inner face of the brake-actuating sleeve P and cause the same to revolve momentarily with the driving-sleeve and independent of the hub-barrel. A slight reverse or rearward rotation of the brake actuating-sleeve, which 'normally is held against turning by reason of its connection with the brake-sleeve, causes the spreading or brake-lever S to be actuated, which in turn causes spreading or expanding of the brake-sleeve against the surrounding hubbarrel. The extent of the braking action being of course in accordance with the rearward r4pressure exerted on the driving-sleeve.

By means of the construction described, the extent of reverse or rearward rotation of the sprocket-wheel required to set the brake is reduced to a minimum, a positive grippingaction is obtained between the wedge-segments and surrounding parts on rotation of the sprocket-wheel, and a free running of the hub with the least possible resistance is assured when the sprocket-wheel is set at rest after the parts have been rotated in a forward direction.

It is within the province of my invention to make changes in the form, shape and construction of parts without departing from the spirit thereof or sacrificing any advantages, and it is therefore desired that the claims be given the broadest interpretation permissible by the prior art.

Vhere in the claims, the term "hub-barrel77 is employed, it is to be understood as covering and having reference to the hubbarrel proper, or a hub-barrel with a part or parts attached thereto.

Having thus described my invention, what I claim is,h

1. The combination with the hub-barrel and a spindle ixedly supported, of a drivingmember rotatable on said spindle and having opposite eccentric surfaces, an interior brakedevice, and propelling and brake wedge-segments co-acting with said eccentric surfaces and adapted to impinge respectively against the surrounding hub-barrel and against said brake-device.

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, 2. The combination with the hub-barrel and a spindle iixedly supported, of a drivingsleeve rotatable on said spindle and having opposite eccentric surfaces, an interior brakedevice, propelling wedge-segments and brake wedge-segments co-acting with said eccentric surfaces and adapted to impinge respectively against the interior of the hub-barrel and against the brake-device, and means for retaining said wedge-segments in operative position.

3. The combination with the hub-barrel and a spindle fixedly supported, of a drivingsleeve rotatable on said spindle and having opposite eccentric surfaces, an interior brakedevice, propelling wedge-segments and brake wedge-segments co-acting with said eccentric surfaces and adapted to impinge respectively against the interior of the hub-barrel and against the brake-device, each of said wedge-segments having its outer surface notched, and a retaining-ring having lateral extensions entering the notches in said wed gesegments.

4. The combination with the hub-barrel and a spindle ixedly supported, of a drivingsleeve between the two and rotatable on said spindle, said sleeve having two pair of opposite eccentric surfaces, two pair of oppositely positioned wedge -segments having corresponding vinner eccentric bearing surfaces and concentric outer impinging surfaces, one

pair of said segments being adapted to impinge against the r surrounding hub-barrel, and an Interior brake-device against which the other pair of said segments is adapted to lmpmge.

5. The combination with the hub-barrel and a spindle fixedly supported, of a drivingsleeve between the two and rotatable on said spindle, said sleeve having two pair of opposite eccentric surfaces, two pair of oppositel)r positioned wedge -segments having corresponding inner eccentric bearing surfaces and concentric outer impinging surfaces provided each with a notch, a retainer-ring between the two pair of wedges provided with lateral extensions fitting the notches in said segments, and an interior brake-device against which one pair of said segments is adapted to impinge to cause actuation thereof, the other pair of segments being adapted to impinge against the surrounding barrel-hub.

6. The combination with the hub-barrel and a spindle fxedly support-ed, of a drivingsleeve rotatable on said spindle and having two pair of opposite eccentric surfaces, two pair of wedge-segments co-acting with said eccentric surfaces and having notches in their outer surfaces, a split-retainer ring having opposite lateral extensions fitting the notches in said segments and having at one end a circular opening and at its other end a correspondingly shaped projection fitting said opening, and a brake-device within the hubrotate in a forward direction on forward rotation of said driving-sleeve, a longitudinally split brake-sleeve within the hub-barrel, a spreading-lever located between the longitudinal edges of said brake-sleeve, and means for actuating said lever on reverse rotation of the driving-sleeve.

8. rl`he conibination with the hub-barrel and a spindle fixedly supported, of a drivingsleeve between the two and rotatable on said spindle, means to cause the hub-barrel to rotate in a forward direction on forward rotation of the driving-sleeve, a longitudinally split brake-sleeve held against rotation within the hub-barrel, a spreading-lever between the longitudinal edges of said brake-sleeve, a brake-actuating sleeve capable of limited rotation and co-operating with said spreadinglever, and a device between the drivingsleeve and the brake-actuating sleeve for causing rotation of the latter to actuate said spreading-lever.

9. The combination with the hub-barrel and a spindle fixedly supported, of a drivingsleeve between the two and rotatable on said spindle, means to cause the hub-barrel to rotate in a forward direction on forward rotation of the driving-sleeve, a longitudinally split brake-'sleeve held against rotation within the hub-barrel and having one of its longitudinal edges provided with a curved notch, a spreading-lever between the longitudinal edges of the brake-sleeve provided with a curved extension fittinOr said notch, a brakeactuating sleeve capable of limited rotation and co-operating with said spreading-lever, and a device between the driving-sleeve and the brake-actuating Sleeve for causing rotaltion of the latter to actuate said spreadingl0. The combination with the hub-barrel and a spindle fixedly supported, of a drivingsleeve between the two and rotatable on said spindle, means to.cause the hub-barrel to rotate in a forward direction on forward rotation of the driving-sleeve, a longitudinally split brake-sleeve held against rotation within the hu b-barrel and having each of its longitudinal edges provided with a curved notch,

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said notches being at different points in the length of the sleeve, a spreading-lever between the longitudinal edges of said brakesleeve and having curved extensions fitting said notches, a brake-actuating sleeve capable of limited rotation and co-operating with said spreading-lever, and a device between the driving-sleeve and the brake-actuating ISO wardly directed ear at one end fitting into the longitudinal groove of said cone-extension, and means to spread the brake-sleeve on reverse movement of the driving-sleeve.

l2. The combination with the hub-barrel and a spindle iixedly supported, of a drivingsleeve between the two and rotatable on said spindle, means to cause the hub-barrel to rotate in a forward direction on forward rotation of the driving-sleeve, a longitudinally split brake-sleeve held against rotation within the hub-barrel, a spreading-lever between the longitudinal edges of said brake-sleeve a brake-actuating sleeve having one end closed and provided with an aperture in said end into which said spreading-lever fits, and a device between the driving-sleeve and the brake-actuating sleeve for causin rotation of the latter to actuate said sprea ing-lever.

13. The combination with the hub-barrel and a spindle fixedljyT su' ported, a brakedevice adapted to act against the inner surface of said hub-barrel l and comprising a braking-element, a brake actuating-sleeve oFeratively connected with said brakinge ement, a sleeve on said spindle having eccentric surfaces, and Ewedge segments coacting with said eccentric surfaces and adapted to be driven against the inner surface of said brake actuating-sleeve when rotating Said spindle in a rearward direction.

In testimony whereof, I have alixed my signature in the presence of two subscribing witnesses.

GUSTAV ZINTER. Witnesses:

EMIL NEUHART, MAY F. SEWERT. 

